Cutting and threading tool



June 13, 1944. c'. J. KOPP 2,351,217

v CUTTING AND THREADING TOOL Filed July 2e, 194:5 2 shets-shee: 1

June 13, 1944. c. J. KOPP 2,351,217

CUTTING AND THREADING TOOL Eiled July 26, 1943 2 Sheets-Sheet 2 Patented June 13, 1944 CUTTING AND THREADING TOOL Carl J. Kopp, Chicago, Ill., assignor to Federal Electric Company, Inc., Chicago, Ill., a corporation of New York Application July 26, 1943, Serial No. 496,176

3 Claims.

This invention relates to a portable device adapted to simultaneously trim or cut and provide a thread on theend of tubes or conduits, particularly non-metallic tubing such as that formed of brous materiall and a binder.

Tubing composed of fibrous material and a binder such as the various natural and synthetic resins, whether of a thermoplastic or thermosetting `nature has come to be employed for a multitude of purposes due to its relatively light weight,. cheapness, and particular suitability for certain purposes, particularly temporary installations. `One particular usage of such tubing is for shot-hole casingin seismographic oil exploration work where various lengths are connected together, portions destroyed during the operations, and the remainder desirably recovered for reuse. For such purpose it is desirable that sections of various length becoupled together or coupled to other necessary-0r existing metallic portions such. as metallic tubing or drilling bits, and that salvaged or .damaged portions be threaded or re-threadedand the ends trimmed to permit the formation` of tightly coupled. joints. Even with new tubing it is not always feasible to provide threaded sections in all necessary lengths, and of course for economical salvage or reuse the end trimming and threading must be performed in the field.

With the foregoing objects in viewy the present invention provides a rugged yet portable tool adapted to provide a surface thread and an adjacent uniformly cut end on tubing of the class described `in. a single operation which can be quickly and conveniently `performed and in an accurate manneron location.

Otherobjects relatingto details of construction and arrangement of parts will be apparent from a consideration of the following specilication end drawings,` wherein:

Fig. 1 is a side elevation of the device of the present invention with an associated tube illustrating lcompletion of the end trimming and thread formation operation thereon, parts being broken away and ,in section.

Fig. 2r is a fragmentary View similar to that of Fig. 1, but illustrating the commencement ofthe trimming and threading operation.

Fig; '3' is asection on the line 3-3 of Fig. 1.

Fig. 4 is a, section onfV the line 4`4 off Fig. r1. t

Fig. ais' a section on'the line 5 5v of Fig. 1. Fig. 6 is a side elevation of the end portions of' two Vtubes which have been trimmed and threaded and joined together byl a coupling sleeve. V-

Referring to the drawings, the reference numeral I0 indicates a shaftV carrying an expansible mandrel II adjacent one end thereof, the opposed end of the shaft being formed with a thread I2 land the intermediate portion `I3 of the shaft being smooth and cylindrical. The threaded shaft portion I2 carries the internally threaded hub member I4 having arms I5 and I6 extending radially therefrom. Mounted on the smooth shaft portion I3 is the smooth bore hub member I'| having operating arms I8 and I9, including tubular hand hold extensions I8 and I9 respectively, extending radially therefrom, the hub Il being longitudinally confined between the collar 20 and the expander bushing 2| which is fixed to the shaft I0 by means of the set screw 22.

The mandrel I I, as illustrated in the section of Fig. 5, is composed of a plurality of segments, held together by means of a pair of split ring springs 23, and is supported on the shaft between the fixed bushing 2| and the travelling expander bushing `24| by means of the expander rod 25 which extends through the shaft I0. The `expander rod 25 may be manipulated to expand and contract the mandrel by means of the handle 26 preferably fixed thereto by means of a pin 21. Thus a tube 28 to be cut and threaded may be slipped over the mandrel II, when the segments thereof are permitted to contract under the action of its springs, and thereafter the handle 26 turned to cause the bushing 24 to be drawn to the bushing 2| and to expand the mandrel segments securely against the inner surface of the tube 28, after adjusting the tube in desired position longitudinally of the mandrel.

`The operating arm 'I8 extending from the `smooth bore hub Il, is. formed with a bore 29 which extends parallel to the shaft I0, and is preferably formed in the thickened boss portion 3i). An elongated tool holder 3| extends slidably through the aperture or bore 29, and is secured to the arm I5 of the threaded hub I4, by means of the shank portion 32 and the locking pin 33.

The outwardly projecting end portion of the tool holder 3| is provided with means for adjustably positioning one or more thread cutting tools, the preferred form. of construction illustrating two adjacent tools', one for making a preliminary cut and the second for making the final cut of proper depth. 'Ihus the terminal end portion of the tool holder 3| is formed with a transverse axially offset slot 34, as illustrated in the sectional view of Fig. 4, through which there is extendeda pair,` of edged` thread cutting tools 35 and 36, spaced by the washer 31. These tools are locked in position by the set screw 38, and may be additionally secured by means of added transversely extending set screws, not shown. The tools 35 and 36 are longitudinally spaced on the holder 3| the distance of a thread equivalent to that of the threads I2 of the threaded shaft portion, theillustrated threads being for example adaptedto ,cut threethreads per inch which has been found desirable for fibrous tubes of the class described. The cutting tool 3'5 may be suitably positioned by iirst extending it against the fixed gauge element 39 on the arm I8, and the tool 36 which makes a preliminary cut adjusted to project to a slightly lesser 'extent than the tool 35.

The operating arm |9 extending from the smooth bore hub I1, carriesr a5 radially slidable tool carriage comprising a block 9 having a bore- 40 so as to enable it to slide longitudinally of the arm:v |9...\.Theblock 9 is formed with a groove 4| Vwhich-rextends-across one` face thereof and at an Aoutwardly-;inclinedv angle, the groove being closed by .the vface plate.42 and screws 43 so as to providea slot within which there is slidably extended the bar 44.` The-bar 44 is xedly se-` cured bythe screws 45 to the radial arm |6 of the threaded vhub I4, and as illustrated inclines downwardly andoutwardly, the angle of incline being the'same as that of thegroove 4|. The laterally projecting portion of. the carriage block 9 is further' formed witha transverse slot 46 for receptionoflthe'radially ,extending cutting tool ,41, the to'ol` being iadjustably positioned by means of the screws 48.

Intheoperationof lthe device a tube to be trimmed and threaded is engaged over the manvdrel'fll .by manipulationof the handle 26 and .35.and .36 spaced froml the edge of the tube. The Aengaged tube may vthen be placed in a Vice or otherwise suitably held, and the cutting mechanism actuated by rotation of the interengaged parts by means of the operating arm extensions I8 and I9',A so as Vto cause-movement of the hub |4 towards the hubfll. A.This causes progressive linward radial movement of the cutting tool 41 to Aprovide an even, neatly trimmed edge, as indicated -in Fig.: 1, and ,simultaneously the thread cutting tools '35 Vand -36 progress longitudinally lto form threads on the outer surface of the tube.

Fig. 6 illlustrates' the manner in which the ends of two tubes threaded and trimmed by the device of the present invention may be coupled to provide a goodjoint. Here -two tubes 49 and 50 are shown coupled in firm endwise abutment by means. of lapsleeve 5|, this sleeve being suitably fof relatively light. metal provided with impressed threads of the same Ipitch as those provided on 1 the tube. v In asimilar manner a metallic tube may be.v coupled to 'a fibrous tube or other necessary metallic.. parts such as a drilling bit may be jcoupled to ajbrous tube.

Iclaim as myr invention: 1. vA deviceof theclass described comprising fa shaft ,f ormedwith, a thread adjacent one end .thereof and an intermediate adjacent smooth :cylindrical portion; and cuttingmechanism ro- 75 tatably carried by both the threaded and smooth portions of the shaft, said mechanism comprising a smooth bore hub carried by the smooth shaft portion between longitudinal confining means thereon, radial operating arms projecting from said hub, one of said arms being formed with an aperture and the other carrying a radially slidable tool .carriage including -an end trimming cutting tool, a Athreadedflriub kcarried by the threaded shaft portion having radial arms projecting therefrom, a tool holder carried by one of its arms parallel to said shaft and extending through said aperture including a thread cutting tool mounted on the projecting end portion thereof, and anxoutwardly inclined laterally extending slide member carried by the opposed arm and slidably engaged with said radially slidable tool carriage whereby actuation of the cutting mechanism to cause movement of the threaded hub towards the longitudinally restricted hub will cause inward radial movement of said slidable carriage. j

2*. A device of the class' described comprising a shaft, `ex-p'ansible mandrel means carried by said `shaft adjacent one end thereof, actuating means extending'thr'oughsaid shaft tov expand and contract the'mandrel, saidshaft being formed with a thread adjacent the opposed end thereof and an intermediate vsmooth cylindrical portion, and interengaged cutting mechanism rotatably carried by both the threaded and smooth portions of the shaft, said mechanism comprising a smooth bore hub carried by the smooth shaft portion between llongitudinal vconfining means thereon, radial operating arms projecting from said hub, one of said arms being'forined with an aperture and a radially slidable tool carriage carried'by the other arm,v a trimming tool mounted on said slidable carriage, a threaded hub carried by the threaded shaft portion, radial arms projecting from the threaded hub, a laterally extending elongated vtool holder carried by one of its arms vand extending through the aperture in said operating arm, a thread cutting tool carried bythe projecting end of said -elongated toolholder, and an inclined laterally extending-member carried bythe opposed arm of said threaded hub and slidably engaged with said radially slidable tool carriage whereby actuation of the cutting mechanism to cause movement of the .threaded hub VIVtowards the longitudinally restricted hub will cause inward radial movement of said slidable: carriage. y f

3. A device o'f the class described comprising a shaft, expansible -mandrel means carried by said shaft adjacentfone end thereof adapted to position a tubular article to be workedA on, said shaft being formed with athread adjacentthe opposed end thereof and an intermediate'smooth cylindrical portion, and interengaged cutting mechanism rotatably carried -by-both the threaded Vand smoothportions of the-shaft, said mechanism comprising ja. smooth bore hub carried by the smooth shaft portion between longitudinal confining means thereof,v radial operating arms projecting from said hub,*on'e of said arms'being formed with an aperture and a radially slidable tool carriage carried by. the other arm, `a radially extending edge cutting tool mounted .on said slidable carriageg, a threaded hub carried bythe threaded shaftvv portio'rn radial arms projecting from the threadedh'ub, an elongated tool holder carried by one of its arms and extending parallel to the shaft and through the aperturein cause movement of the threaded hub towards the longitudinally restricted hub will cause inward radial movement of said slidable carriage and thereby simultaneously cut an engaged tubular article perpendicular to its axis and form a thread on its surface adjacent to the aforesaid cut portion.

CARL J. KOPP. 

